#include <c8051f120.h>                
#include <stdio.h>
#define zz 50;
sbit LED_BLINK = P1^6;
unsigned int counter = 50;



void Port_Init (void);                
void Timer0_Init (void);

void Oscillator_Init()
{
    char SFRPAGE_SAVE = SFRPAGE;
    int i = 0;
    SFRPAGE   = CONFIG_PAGE;
    OSCICN    = 0x81;
    CCH0CN    &= ~0x20;
    SFRPAGE   = LEGACY_PAGE;
    FLSCL     = 0xB0;
    SFRPAGE   = CONFIG_PAGE;
    CCH0CN    |= 0x20;
    PLL0CN    |= 0x01;
    PLL0DIV   = 0x01;
    PLL0FLT   = 0x0F;
    PLL0MUL   = 0x10;
    for (i = 0; i < 15; i++);  // Wait 5us for initialization
    PLL0CN    |= 0x02;
    while ((PLL0CN & 0x10) == 0);
    CLKSEL    = 0x02;
    SFRPAGE = SFRPAGE_SAVE;
}


void Port_Init (void)
{
   char SFRPAGE_SAVE = SFRPAGE;        

   SFRPAGE = CONFIG_PAGE;              

   XBR2 = 0x40;                        
   P1MDOUT = 0x40;                    

   SFRPAGE = SFRPAGE_SAVE;            
}

void Timer0_Init(void)
{
   char SFRPAGE_SAVE = SFRPAGE;        // Save Current SFR page

   SFRPAGE = TIMER01_PAGE;             // Set SFR page

   TH0 = 0xDB;
   TL0 = 0xF2;                         // Init Timer0 Low register
   TMOD = 0x01;                        // Timer0 in 16-bit mode
   CKCON = 0x02;                       // Timer0 uses a 1:48 prescaler
   ET0 = 1;                            // Timer0 interrupt enabled
   TCON = 0x10;                        // Timer0 ON

   SFRPAGE = SFRPAGE_SAVE;             // Restore SFR page
}

void Timer0_ISR (void) interrupt 1
{
//counter = zz;                        // Здесь было counter = 50;
TF0 = 0;
counter--;
if (counter == 0)
{
   counter = zz;                      // Здесь было counter = 50;
   LED_BLINK = ~LED_BLINK;
}
TH0 = 0xDB;
TL0 = 0xF2;
}

void main(void)
{
   WDTCN = 0xDE;                       // Disable watchdog timer
   WDTCN = 0xAD;

   Oscillator_Init();
   Timer0_Init ();                     // Initialize the Timer0
   Port_Init ();                       // Init Ports
   EA = 1;                             // Enable global interrupts
   //LED_BLINK = 0;
   while (1);
}

#define zz 50;
unsigned int counter = zz;